Marking pen



FIG. 1 is a perspective view of a marking pen showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side elevational thereof, the opposite side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a front elevational view thereof, with the writing tip extended; and

FIG. 8 is a side elevational view of FIG. 7, the opposite side being a mirror image thereof. 

The ornamental design for a marking pen, as shown and described. 